Uracil-DNA glycosylase activities in hyperthermophilic micro-organisms
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چکیده
منابع مشابه
Uracil-DNA glycosylase. Purification and properties of uracil-DNA glycosylase from Micrococcus luteus.
A uracil-DNA-glycosylase from Micrococcus luteus has been purified more than 3,000-fold. The enzyme preparation appears homogeneous, according to the results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It is devoid of nonspecific endonucleases, specific endonucleases for apurinic and apyrimidinic sites, 3-methyladenine or 7-methylguanine-DNA-glycosylases. It behaves as a monom...
متن کاملCrystal structure of mimivirus uracil-DNA glycosylase
Cytosine deamination induced by stresses or enzymatic catalysis converts deoxycytidine into deoxyuridine, thereby introducing a G to A mutation after DNA replication. Base-excision repair to correct uracil to cytosine is initiated by uracil-DNA glycosylase (UDG), which recognizes and eliminates uracil from DNA. Mimivirus, one of the largest known viruses, also encodes a distinctive UDG gene con...
متن کاملUracil-DNA glycosylase of thermophilic Thermothrix thiopara.
An activity which released free uracil from dUMP-containing DNA was purified approximately 1,700-fold from extracts of Thermothrix thiopara, the first such activity to be isolated from extremely thermophilic bacteria. The enzyme appeared homogeneous, according to the results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It had a native molecular weight of 26,000 and existed as a...
متن کاملMutations at Arginine 276 transform human uracil-DNA glycosylase into a single-stranded DNA-specific uracil-DNA glycosylase.
To investigate the role of Arginine 276 in the conserved leucine-loop of human uracil-DNA glycosylase (UNG), the effects of six R276 amino acid substitutions (C, E, H, L, W, and Y) on nucleotide flipping and enzyme conformational change were determined using transient and steady state, fluorescence-based, kinetic analysis. Relative to UNG, the mutant proteins exhibited a 2.6- to 7.7-fold reduct...
متن کاملNovel activities of human uracil DNA N-glycosylase for cytosine-derived products of oxidative DNA damage.
Uracil DNA N-glycosylase is a repair enzyme that releases uracil from DNA. A major function of this enzyme is presumably to protect the genome from pre-mutagenic uracil resulting from deamination of cytosine in DNA. Here, we report that human uracil DNA N-glycosylase also recognizes three uracil derivatives that are generated as major products of cytosine in DNA by hydroxyl radical attack or ot...
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ژورنال
عنوان ژورنال: FEMS Microbiology Letters
سال: 1996
ISSN: 0378-1097,1574-6968
DOI: 10.1111/j.1574-6968.1996.tb08491.x